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Calibration of stochastic finite-fault ground motion simulations for the 1997 Umbria-Marche, Central Italy, earthquake sequence
Authors:R Berardi  M J Jimnez  G Zonno  M García-Fernndez
Institution:

a ENEL-Engineering and Construction, S.p.A., Viale Regina Margherita 137, I-00198 Rome, Italy

b Institute of Earth Sciences ‘Jaume Almera’-CSIC, Lluis Sole i Sabaris, s/n, E-08028 Barcelona, Spain

c Istituto di Ricerca sul Rischio Sismico-CNR, Via Bassini, 15, I-20133 Milan, Italy

Abstract:The recent 1997 Umbria-Marche, Central Italy, earthquake sequence allowed us to model recorded ground motions using a method developed by Beresnev and Atkinson Bull Seism Soc Am 87 (1997) 67–84; Seism Res Lett, 69 (1998) 27–32; Bull Seism Soc Am 88 (1998) 1392–1401]. The method generalizes the stochastic ground-motion simulation technique, developed for point sources, to the case of finite faults. It subdivides the fault plane into subfaults and assumes each subfault to be a point source with a ω2 spectrum. Geometric spreading and regional anelastic attenuation are included in the model. The data include horizontal acceleration recordings from the SSN and ENEL databases of the 1997 Umbria-Marche events on 26 September, at 00:33 GMT, with Mw=5.7, and at 09:40 GMT, with Mw=6.0; and on 14 October at 15:23 GMT, with Mw=5.6. The strong motion simulations are performed using model parameters based on the results of previous studies, and adjusting the subfault size to calibrate the simulation model against recorded ground motions. Local site response is considered to account for observed amplification effects at specific recording sites (e.g. Nocera Umbra). A good agreement is found between the simulated response spectra and the recorded data, concluding that this method reproduces the salient ground-motion characteristics at different distances and azimuths.
Keywords:Stochastic finite-fault modeling  Ground motion simulation  Response spectra  Local effects  Umbria-Marche sequence
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